Balanced rocker-valve



(No Model.)

A. B. GARLL. BALANGED ROCKER VALVE.

Patented Apr. 6, 1886.

Lidia on E UzrZZ N. PETERS, Phom-Lilhngmphun WAFhinglcn. (IV C.

lllnrrnn STATES PATENT OFFICE.

ADDISON B. CARLL, OF BRADFORD, PENNSYLVANIA.

BALANCED ROCKER-VALVE.

.i'ZuPEGIFIQATION forming part of Letters Patent No. 339,265, datedApril 6,1886.

(No model.)

' To all whom it may concern:

Be it known that I, ADDISON B. CARLL, a citizen of the United States,residing at Bradford, in the county of McKean and State of Pennsylvania,have invented a new and useful Improvement in Balanced Rocker-Valves, ofwhich the following is a specification, reference being had to theaccompanying draw lugs.

My invention relates to an improvement in balanced oscillating valvesfor steam-engines; and it consistsin the peculiar construction andcombination of devices that will be more fully set forth hereinafter,and particularly pointed out in the claims.

In the drawings, Figure 1 is a longitudinal sectional view of a portionof a steam-cylinder and a steam-chest with myimproved valve re moved.Fig. 2 is a vertical transverse sectional view o.l.' the same with thevalve in position. Fig. 3 is an end elevation of the Valve. Fig. 4 is aside elevation of the same, partlyin section.

A represents a steam-cylinder, and B represents the steanrchest on theunder side of the cylinder.

0 represents a hollow cylindrical valve, which is formed of twosections, 0 c, fitted together and extensible telescopically, one of thesaid sections having inwardly-projecting pins c, that enter and work ingrooves or slots 1) made in the other section. The ends of the valve areflanged, as at d, and beveled on their inner sides. The ends of thevalve have the inlet-openings c and the radial openings f, thatcommunicate with the interior of the valve, and radial notches g are cutthrough the flanges on the ends of the valve between the openings f. Thevalve is journaled in the steam-chest by means of trunnions 7: on theends of the valve, and recesses '27 in the side' walls of thesteam-chest to receive them. The side walls of the steam-chest also haveports Z, that correspond with the openings 6 of the valve, and theseries of alternately-arranged radial ports at and a. The ports oncommunicate with a channel, m, that leads to one end of the cylinder andthe ports a communicate with achannel, a, that leads to the other end ofthe cylinder. The ports Z communicate with channels Z in the sides ofthe cylinder through which steam is admitted, and the steam-chest has anexhaust-port, one or more, 0.

A valve-stem, D, is socketed at one end to one of the trunnions of thevalve, and has a crank at its outer end, which is attached by a rod toan ordinary eccentric, with which the engine is provided, in the usualmanner. It will thus be seen that the ends of the valve bear against theside walls of the steam-chest and is balanced therein by the pressure ofthe steam in and around the valve, which reduces friction thereon. Thepressure of the steam on the inside of the valve keeps the ends of thevalve tightly pressed against the side walls of the steam-chest.

The valve is oscillated, slightly when the engine is in motion. lVhenthe openingsf in the valves register with the openings at in thesteam-chest, steam is admitted to one end of the cylinder, and thenotches g in the flanges of the valve register with the openings a, soas to exhaust the steam from the opposite end of the cylinder. \Vhen thevalve is turned to cause the openings f to register with the openings a,steam is admitted to the cylinder through the channels a and exhaustedfrom the opposite end thereof, as will be very readily understood.

By this construction of the valve itis only necessary to oscillate thelatter very slightly, thus reducing wear on the valve and valveseat to aminimum, and eifeeting an economy in repairs for the engine bylengthening the life of the valve.

Having thus described my invention, I claim 1. The combination, in asteam-engine, of the steam-chest having the radial openings on n in itsside walls and arranged alternately and communicating with opposite endsof the cylinder, and an inlet and anexhaust port, with the cylindricaloscillating valve in the steamchest having the radial openings f toalign alternately with the openings ma and the radial notches orpassages 9 between the openings f, for the purpose set forth,substantially as de scribed.

2. The combination,in a steam-engine, of the steam-chest having theradial alternate series of ports m n in itsside walls and theoscillating In testimony that I claim the foregoing as my cylindricalvalve in the steam chest having own I have hereto affixed my signaturein the radial openings f, to register alternately presence of twowitnesses.

with the ports m and n, and the end flanges ADDISON B. GARLL. having theradial passages or notches g be-' \Vitnesses:

tween the openings f, substantially as de- GEO. A. STURGEON,

scribed. GEORGE H. BELLoWs.

